Hello thank you for your reply I will take a look on your link.
When I do a move I create a clone of my chess board and I do the move on this clone. On the software "yourkit" I saw it takes 75% of time. Each pseudo code which I have seen use do undo I will change my code to use that
thank you =)

Hello I'm currently programming an AI for chess in Java, I have an Alphabeta algorithm with memory ( Transposition tables ), I'm using multi-thread at the root node. Also I'm using quiescence search with only capture move.
For the moment Alphabeta is with depth = 4 and quiescence depth = 3. On ...